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I To all whom it may concern:

' I-Iolbrook, county of Norfolk,- State of sachusetts, have invented a certain new and SAMUEL B. FIELD, OF nommoommnssAorrnsn'rrs, .essrenoa 'ro PNEUMATIC seems -i .ooaromrron, LIMITED, or QUINCY, mssaonusnrrs, A CORPORATION O MAINE.

MOISTURE-PROOF ADHESIVE comb-(m1).-

No Drawing.

B. FIELD, a at as- Be it known that I, SAMUEL citizen of the United States, residin useful Improvement in Moisture-Proof Ad- --hesiv e Compound, of which the following is a specification, reference being had therein to the accompanying drawings.

' The object of the invention is to provide a moisture proof (adhesive compound which in normal atmospheric conditions is hard,

- cohesive and non-sticky. and which when said invention is intended to be applied is which it isfapplied is bent.

heated to'a temperature considerably above any normal atmospheric temperature becomes sticky. The special use to which the to provide an adhesive moistureproof coating for packages in which package-goods are put up andin which the material of the shel itself or of the wrapper is' of nonmoisture proof material. .It is important that this coating shall not only be moisture. proof and adhesive and non-sticky when dry, 'but also'it is preferable that it should be pliable and tough when dryso that it will not readily crack when'the paper to The invention will be fully understood from the following description and the novel features thereof will be pointed out and clearly defined in the claims at this'specification.

the close of The base of the composition is resinous pitch, preferably Burgundy pitch because the melting point is considerably lower than other kinds of pitch. The pitch is combined with paraflin and rosin 011, preferably in about the following proportions, one and one-half pounds of pitch, three ounces of paraffin and eight one-hundreths of an ounce of rosi 011. In preparing the composition the pitch is melted and then the whilejin'a highly heated condition. It may I then be allowed to cooland form a sol d mass which isdry under normalatmospherlc' paraflin and rosintoil are added, the ingredi ents all being thoroughly mixed [together conditions and non-sticky. When it is 'desired" to apply a coating of saidcomposition to any surace the composition is again heated to a high degree sufficient to bringit perature' and capable of adhes1vel unitlng (to a' liquid or semi-liquid state and then a thin 'film is'spread over" the surface .of the article which is desired to be rendered-moistwo surfaces togglaher and again the sheet is to be wrapped or to cause an I adhesion between thecoated sheet and another sheet of paper the two sheets of paper which are to be given adhesive connection are superimposedone upon the other, or in the case of a package the coated sheet may be wrapped around the package, and then heat is applied tothe outer surface suflicient to meltthe adhesive coating So as to render it sticky. Byapplying pressure While the coating is stlcky the two surfaces will be caused to adhere together. The two articles which are to be umted are then allowed to cool and the adhesivecoating will become dry and firmly unitetogether the two articles or surfaces. I The paraffin and rosin oil both aid in makequivalent thereof is omitted and paraflin alone is mixed with the pitch, so much paraflin has to be used that the compound is Specification of Letters Patent. I Patentgd Jung 1",? how,

' Application filed December 20, 1917. Serial No. 208,074.

im; the film pliable. If the rosin oil or some not sticky enough when hot to give'the proper adhesive quality. If the parafiin or someequivalent thereof is .not used and if I rosin oil; alone is used with the pitch to rendersit pliable so much, rosin oil has to be used tomake the film pliable that the mix-' ture is non-drying when cool and the coated sheet will also be sticky in normal tempera ture. The use of both paraffin and rosin oil keeps the coatin or the film in proper condition so that alt ough it is sticky when hot, it is both pliable and non-sticky when cool or. when it is at any normal atmospheric temperature.

' 'What. I claim is :I

'1. A moisture repellent adhesive com- "pound consisting of a composition of'pitch,

Zparaflin'and. rosin oil characterized by being dry and non-sticky under normal atmosphericconditions and of becoming soft and sticky when heated'to a high degree of temecoming dry and non-stic and capable of retaining two surfaces adhesively united when it is cooled again to normal temperature.

2.. A moisture repellent adhesive compound consisting of a composition of Burgundy pitch, paraffin and rosin oil characterized by being dry and non-sticky under normal atmospheric conditions and of becomin soft and sticky when heated to a high cegree of temperature and capable of adhesively uniting two surfaces together and again becoming dry and non-sticky and capable of retaining two surfaces adhesively united when it is cooled again to normal temperature.

3. A moisture repellent adhesive compound consisting of a composition of pitch, paraflin and rosin oil in substantially the following proportions, one and one-half pounds of pitch, three ounces of paraffin, and eight one-hundredths of an ounce of rosin oil, said composition being-characterized by being dry and non-sticky under nonma-l atmospheric conditions and of becom ing soft and sticky when heated to a high degree of temperature and capable of adhesively'uniting two surfaces together and again becoming dry and non-sticky and capable of retaining two surfaces adhesively united when it is cooled again to normal temperature.

4. A moisture repellent adhesive compound consisting exclusively of pitch, parailin and rosin oil thoroughly mixed together, said ingredients being compounded in substantially the following proportions, one and one-half pounds of pitch, three ounces of paraffin and eight one-hundredths of an ounce of rosin oil, said composition being sticky and capable of adhesively uniting two surfaces together when the composition is softened by a high degree of heat, and being dry and non-sticky when cooled to normal atmospheric temperature.

In testimony whereof I affix my signature.

SAMUEL B. FIELD. 

